Idle pulse to 0 and back
Discussion
Some help/advice please...
Went for a drive, stopped off for some fuel (Shell VMax full tank).
Carried on journey and all fine. Get to destination and switch off for s good 30 mins.
Start up and after a min or two it starts doing the following https://youtu.be/9XftbLY59uI
My gut feeling says fuel related possible dirty fuel or crp from bottom of tank has got into fuel filter?
Anyway any help or pointers appreciated
Went for a drive, stopped off for some fuel (Shell VMax full tank).
Carried on journey and all fine. Get to destination and switch off for s good 30 mins.
Start up and after a min or two it starts doing the following https://youtu.be/9XftbLY59uI
My gut feeling says fuel related possible dirty fuel or crp from bottom of tank has got into fuel filter?
Anyway any help or pointers appreciated
Unplug the stepper and see if it will keep idling as on a warm engine it should tick over nicely. This will eliminate anything odd with the ECU. It could be an air leak in the plenum making the mixture unstable when the throttle is shut, or ignition dropping a cylinder as the RPM drops, and the ECU trying to control the idle, leading to that type of cycling.
blitzracing said:
Unplug the stepper and see if it will keep idling as on a warm engine it should tick over nicely. This will eliminate anything odd with the ECU. It could be an air leak in the plenum making the mixture unstable when the throttle is shut, or ignition dropping a cylinder as the RPM drops, and the ECU trying to control the idle, leading to that type of cycling.
Thanks will give that a go tomorrow. Actually I did take off the Stepper motor the other day to give it a clean. It has no gasket (Should it?) seems odd to me so i put some PTFE tape around the thread, looked like some had already been applied before too. So maybe that's all it needs?I'll see if I can find any leak in the plenum.
Thanks.
Started car from cold, left to idle till it got warm. At about 75c it started to do the above. Unplugged stepper motor and engine settled and ran fine, plugged stepper back in and instantly went back to what it's doing in video. I'll wait for it to cool down again and strip it out.
Thanks for the pointer.
Thanks for the pointer.
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